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Lipids perform diverse and dynamic roles in living systems beyond serving as structural components of membranes and energy reserves. As signaling molecules, certain lipids act as key mediators in cell communication and regulation. Steroid hormones such as estrogen, testosterone, and cortisol are derived from cholesterol and easily diffuse across cell membranes to _____ ____ ____ _______ ____ _____ ________ ____ _________ _____ ____ ___.
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